在焊接后通常对铸铁件和其它一些焊后易裂件进行焊后保温缓冷,这是避免产生白口、防止裂纹的主要手段。以前我厂对易裂件焊后保温一般使用草木灰或石棉粉,但经实际使用认为,这两种材料虽然能起到一定的保温作用,但还存在着如下不足:(1)污染环境,对人身体有一定的刺激作用;(2)在草木灰中堆放高温工件不 After the welding is usually cast iron and some other parts after welding easy to crack cold insulation insulation, which is to avoid white, the main means of preventing cracks. In the past, we used ash or asbestos powder to heat cracked parts after welding. However, the actual use of these two kinds of materials, although they can play a role of heat preservation, still has the following shortcomings: (1) pollution of the environment, People have a certain stimulating effect on the body; (2) high-temperature parts of the ash in the ash is not stacked